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United States Patent | 5,687,807 |
Woods ,   et al. | November 18, 1997 |
A cutter for a trenchless boring apparatus includes a mount having a first end to be coupled to a free end of a drill pipe. A plurality of cutting teeth are secured to the mount with the teeth arranged in a helical pattern surrounding an axis of the mount.
Inventors: | Woods; James Akers (Stuart, VA); Runquist; Randy Ray (Lovilia, IA) |
Assignee: | Vermeer Manufacturing Company (Pella, IA) |
Appl. No.: | 429495 |
Filed: | April 26, 1995 |
Current U.S. Class: | 175/393; 175/394; 175/397; 175/406 |
Intern'l Class: | E21B 010/42; E21B 010/44; E21B 010/60 |
Field of Search: | 175/394,397,406,53,62,323,393 |
3202228 | Aug., 1965 | Schuster | 175/53. |
3763942 | Oct., 1973 | Levitt | 175/394. |
3894402 | Jul., 1975 | Cherrington | 175/53. |
4061197 | Dec., 1977 | Skidmore, Jr. | 175/394. |
4986375 | Jan., 1991 | Maher | 175/323. |
5341888 | Aug., 1994 | Deschutter | 175/323. |